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The good news is: we have climate control. Also, it's MUCH easier to layer for warmth than it is to cool off. Invest in a couple nice pairs of wool leggings. They're better at regulating temperature than cotton, and the wardrobe change might help motivate you to go do the thing. REI has a smartwool pair on sale right now (extra 20% if you're a member): https://www.rei.com/product/246624/smartwool-active-ribbed-leggings-womens